Nitrous OxideDenitrificationFertilizersSoilMethaneAgricultureNitrogenAir PollutantsNitrogen CycleSoil MicrobiologySoil PollutantsAnesthetics, InhalationAnesthesia, InhalationNitric Oxide SynthaseIsofluraneXenonMethyl EthersAnesthetics, CombinedHalothaneNitric Oxide Synthase Type IIAnesthesia, GeneralPositron-Emission TomographyNitritesOxidesOtoacoustic Emissions, SpontaneousNitrificationNitratesFentanylEnfluraneAnesthesia, DentalTomography, Emission-Computed